What Is a Construction Change Order and How Do You Handle One?

A change order is a formal written amendment to the construction contract that changes the scope, price, schedule, or all three — and the key word is formal. Verbal 'just do it' instructions are where owners lose money and contractors lose payment leverage. Legitimate change orders come from three sources: owner-requested changes, unforeseen conditions like bad soils or hidden structural damage, and design gaps or errors. The right mindset is management, not elimination. A project with zero change orders either had perfect documents and zero surprises — rare — or has costs buried somewhere they'll surface later. Budget a contingency, run a tight process, and judge each change on its merits.

Owner changes are your choice and your cost — the discipline here is deciding deliberately, with the price and schedule impact in front of you before you say yes. Small 'while you're at it' requests compound; batch them and price them together. Unforeseen conditions are nobody's fault: rock where the borings showed soil, asbestos in the walls, a rotted beam behind the plaster. The contract should define how differing site conditions are handled, and the geotechnical report plus exploratory demolition are your pre-construction defenses. Design gaps are the preventable category. Incomplete details, uncoordinated MEP and structure, missing dimensions — these generate the RFIs that become change orders. This is where design fee savings evaporate: every dollar saved on coordination returns as several dollars in field changes.

Process beats vigilance. Set this up in the contract and enforce it from day one. Non-negotiable elements of change control.

• Written change requests only — no verbal authorizations, no 'we'll paper it later'
• Priced before performance: itemized labor, materials, equipment, and markup disclosed
• Schedule impact stated on every change order, even if the answer is zero days
• A single authorized approver on the owner side with a dollar threshold for escalation
• Monthly change-order log reviewed against contingency — track the burn rate
• Emergency exception defined narrowly: safety and property protection only, documented within 24 hours